Gorton, Gerald C. & Dryer, Murray. Comparison at supersonic speeds of translating spike inlets having blunt- and sharp-lip cowls, report, January 19, 1954; (https://digital.library.unt.edu/ark:/67531/metadc64825/m1/1/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .